International Paralympic Committee (IPC) and International Blind Sports Federation (IBSA) Joint Position Stand on the Sport-Specific Classification of Athletes with Vision Impairment.

For instance, there may be significant variation in an athlete's ability to perceive contrast, depth, movement, and to see in the presence of bright light, depending on the medical condition causing their impairment.

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This is of particular concern because there is likely to be significant variation in the visual function of VI athletes who might have the same visual acuity, but which is caused by a range of different medical conditions.

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